title: Angular frequency filtering: a basis for pattern decomposition.
abstract: Much insight has been gained into the nature of early vision by postulating that the system encodes patterns by means of channels, or filters, tuned to specific orientations and spatial frequencies. We argue that a different decomposition, in terms of radially and rotationally symmetrical filters, is equally plausible, both in terms of the geometry of the eye and the ecology of visual pattern recognition. We demonstrate experimentally some of the properties of angular frequency filtering.
authors.affiliation: Laboratorio de Percepcao Visual, Universidade Federal de Pernambuco, Recife, PE, Brazil.
authors.forename: M L
authors.initials: ML
authors.lastname: Simas
authors.forename: P C
authors.initials: PC
authors.lastname: Dodwell
mesh_terms: D015350:Contrast Sensitivity / Q000502:physiology; D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010865:Pilot Projects; D011601:Psychophysics; D014795:Visual Pathways / Q000502:physiology